I don't know, never tried it, When I find something that works well I stick with it. In a saltwater boat if it can corrode, it will. Never had any problems with the heat shrink connectors as they seal both sides of the connection. You'll notice in the picture the small bead of sealant that squeezes out of the end of the connector.
Here's a link
http://cgi.ebay.com/165-HEAT-SHRINK-...ategoryZ48716Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://www.***boat.com/image_center/...The_stuff2.JPG
Neat job. I'm trying to figure out where you mounted the terminal block and what is the black tubing is that you put all your wires through. MORE PICTURES - Please.